CMOS
Beginner
The way nearly all chips are built: the two kinds of transistor work in pairs, so one is off whenever the other is on.
Novice
Complementary metal–oxide–semiconductor: logic built from NMOS and PMOS transistors working in pairs, so that in a steady state there is no direct path from the supply to ground and almost no power is drawn.
Expert
Static CMOS uses a PMOS pull-up network and an NMOS pull-down network that are logical complements. It replaced nMOS-only logic because it draws essentially only leakage when idle.